Parton content of virtual photons

Journal Article · Sat Apr 01 04:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.3220· OSTI ID:6475047

Glueck, M; Reya, E; Stratmann, M ^[1]

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1. Institut fuer Physik,Universitaet Dortmund, D-44221 Dortmund (Germany)

The parton content of virtual transverse photons [gamma]([ital P][sup 2]) is expressed in terms of perturbative pointlike and nonperturbative hadronic (VMD) components. The resulting LO and NLO parton distributions [ital f][sup [gamma]([ital P]2])([ital x],[ital Q][sup 2]) are [ital smooth] in [ital P][sup 2]. They apply uniformly to [ital all] [ital P][sup 2][ge]0 whenever [gamma]([ital P][sup 2]) is probed at a scale [ital Q][sup 2][much gt][ital P][sup 2] where the transverse photons furthermore also dominate physically relevant cross sections. Predictions are given for [ital F][sub 2][sup [gamma]([ital P]2])([ital x],[ital Q][sup 2]) and [mu][sup [gamma]([ital P]2])([ital x],[ital Q][sup 2]), [ital g][sup [gamma]([ital P]2])([ital x],[ital Q][sup 2]) relevant for future CERN LEP and present DESY HERA measurements, respectively. Except for certain kinematic regions, these virtual structure functions and parton distributions at [Lambda][sup 2][much lt][ital P][sup 2][much lt][ital Q][sup 2] are [ital not] solely described by purely perturbative contributions, in contrast with naive'' expectations; these remaining nonperturbative components, although being based on VMD-inspired simplicity, represent the largest uncertainty in our quantitative results and eventually have to be tested by future experiments.

• OSTI ID: 6475047
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662230 -- Quantum Chromodynamics-- (1992-)
662310 -- Weak & Electromagnetic Interactions of Leptons-- (1992-)
662330* -- Photon & Charged-Lepton Interactions with Hadrons-- (1992)
662440 -- Properties of Other Particles Including Hypothetical Particles-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSONS
CROSS SECTIONS
DISTRIBUTION
ELEMENTARY PARTICLES
FUNCTIONS
MASSLESS PARTICLES
PARTONS
PERTURBATION THEORY
PHOTONS
POSTULATED PARTICLES
STRUCTURE FUNCTIONS
VIRTUAL PARTICLES